2/4 hand where i have top pair but it sucks

i dont raise here much preflop but there was kind of an ante so i did. his range is so wide i couldnt decide on my best turn action...the pot got big pretty fast so i dont want to have to bet then fold, but not betting seems bad.

im assuming he sucks because he posted the BB and SB in MP

PokerStars No-Limit Hold'em, $4 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

saw flop|saw showdown

MP ($571.30)
Hero ($442)
SB ($758)
BB ($658.60)
UTG ($377.60)

Preflop: Hero is Button with 7, 9. MP posts a blind of $6.
1 fold, MP (poster) checks, Hero raises to $24, 2 folds, MP calls $20.

Flop: ($56) 7, 3, 4 (2 players)
MP checks, Hero bets $54, MP calls $54.

Turn: ($164) 3 (2 players)
MP checks, ???

also keep in mind, the goal is to stack lukie, who folded his blind. if i play this over aggro it might help my chances vs him.

What's wrong with bet/fold 100$? He's probably not aggro enough for a river bluff.

I think b/f is the only way to go here against an unknown (probable donk). I think the likelyhood he will c/r as a bluff or semi-bluff is very low here.